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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58737cad8e409a4872bfe6ade1ae7ae0ce9cb981c1513c0c3565eaf8ac2df0d0' 
  AND token = 'F43eKl00hA+XoyCj9AVoLyhHKjZP1UNqZxL2MFBu7wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}